public class Hello{
    public static void  main(String  args[]){
      System.out.println("大家好！");
      System.out.println("Nice to meet you");
      Student.stu = new Student();
      stu.speak("We are students");
     }
   }
   class Student{
      public  void speak(String s){
         System.out.println(s);
      }
   }
